| Your IP address and user agent are shared with Google, together with performance and security metrics, to ensure quality of service, generate usage statistics and to detect and address abuse | Verlag Harri German, 5th edition, Thun and Frankfurt 2001, p |
|---|---|
| Lee Johnson 2020-11-02 , , Sciencing, Retrieved 2020-11-26 | in modern notation, with introductory chapters |
An exploration of twenty key images, Mathematical Association of America, 2011, p.
20| 1914 , page 193 via• , The Elements of Geometry, in Eight Books; or, First Step in Applied Logic London, Longmans, Green, Reader and Dyer, 1874 , p | , "Some impossible constructions in elementary geometry", Mathematical Gazette 88, November 2004, 548—551 |
|---|---|
| Altshiller-Court, Nathan, College Geometry, Dover, 2007 orig | Todor Zaharinov, "The Simson triangle and its properties", Forum Geometricorum 17 2017 , 373--381 |
Science in the Ancient World: An Encyclopedia.
| ; Askey, Richard; Roy, Ranjan 1999 | "On the Equations and Properties: 1 of the System of Circles Touching Three Circles in a Plane; 2 of the System of Spheres Touching Four Spheres in Space; 3 of the System of Circles Touching Three Circles on a Sphere; 4 of the System of Conics Inscribed to a Conic, and Touching Three Inscribed Conics in a Plane" |
|---|---|
| A Distorted View of Geometry | See in particular the bottom of p |
Advanced Euclidean Geometry: An Elementary treatise on the geometry of the Triangle and the Circle.
30